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chain tensioners
How can I certificate that my car has the carrera tensioners?
Are they the ones with the oil pistons? |
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02-25-2000, 08:03 AM
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Hi, The Carrera chain tensioners are easily identified by the oil lines w/ the bango fittings on top of the tensioner cover on each cylinder bank.
Lee 79 SC Targa w/ Hydro chain tensioners!! |
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02-25-2000, 09:58 AM
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Hi,
When I bought my '76 911S, I was told by the seller that my tensioners were converted to the 930 type(turbo tensioners). Should I have the tensioners converted(I don't see any oil lines leading to either tensioner cover) to carrera tensioners? The car has 112K miles and I doubt if any major work has been done on the engine. The seller did say a recent valve job was done, though. Thanks in advance. Jeff 1976 911S |
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02-25-2000, 04:46 PM
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Jeff, There were two types of tensioner that were commonly called 'turbo' tensioners, just prior to the introduction of the 1984 Carrera oil-fed tensioners, one had the part number 930.105.049.00 anthe other was 930.105.053.00, but the first was just as unreliable as the previous versions, and the second one, called the 1980 1/2 - 1983 version, is only tolerable if the chain wheel supports with dual bushings were installed at the same time, something very few people did, due to the 'misunderstandings' and myths surrounding the 'tensioner problem'!!! Bruce Anderson does a thorough job of discussing the history and facts surrounding the problem in his 'Porsche 911 Performance Handbook' ... a highly recommended book for ALL 911 enthusiasts, and REQUIRED reading, even if you do not intend to ever modify your car. There is simply no other book like it on the market!
------------------ Warren Hall 1973 911S Targa |
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02-25-2000, 05:07 PM
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Warren,
What do you suggest? Should I get the chain supports with bushings, or should I just go for the Carrera tensioners? I do have Bruce Anderson's Performance Handbook; I just haven't gotten that far yet. What do you mean by "tolerable"? Does this still mean it's much better to just go for the Carrera tensioners? Is it easy to install? I should probably take a look at the insides first before I do buy anything, though...and while I'm at it (checking the type of tensioners require dropping of engine, right?) how would I know if my head studs are raceware studs or not? Heck, while I have my engine out, would you recommend a rebuild? I'm gonna get the compression checked soon, so I'll update you on that. Gee...I guess that replacement for my mashed up fender will have to wait. Thanks! |
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02-25-2000, 09:02 PM
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Jeff, If you have the later '80.5 tensioners and the 'spacers', then I would suggest getting the double bushing chain wheel supports and installing the 'Hydra-stop' devices to prevent total collapse and failure of the tensioners. If you have the earlier '049' turbo tensioners, then I suggest the whole upgrade: oil-fed tensioners and double bushing chain wheel supports. I know that is a big hit to the wallet, but I just don't understand why the upgrade kits aren't equipped with the chain wheel supports!!! It really is the best, safest thing to do. I think you will agree, after you have read Bruce Anderson's discussion of this matter!
------------------ Warren Hall 1973 911S Targa [This message has been edited by Early_S_Man (edited 02-26-2000).] |
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02-26-2000, 06:19 AM
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